.header {
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    background-color: $mainBg;
    color: $mainColor;
    box-sizing: border-box;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    font-size: 18px;
    height: 60px;
    line-height: 1;
    padding: 0 10px;
    text-align: center;
    white-space: nowrap;
  }
  
  .header-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: inherit;
    font-weight: 400;
    flex: 1;
  }
  
  .header-button.is-left {
    text-align: left;
  }
  
  .header-button.is-right {
    text-align: right;
  }
  
  .header-button {
    flex: 0.5;
  }